Wissenschaftliche Veröffentlichungen aus den Siemens-Werken, volume XVII, no.1, pp.99-106. Berlin: J. Springer, 1939. 4° (259 x 194mm). With a SIGNED PHOTOGRAPH OF ERNST RUSKA. It was at Siemens and Halske's Laboratory for Electron Optics that Borries and Ruska developed the electron microscope, and around 35 different apparatuses were mass-produced for research purposes up until 1945. When Borries left the laboratory in 1949 Ruska succeeded him as director, and continued to contribute substantially to the improvement of the microscope in subsequent years. Gedeon pp.428-33." /> BORRIES, Bodo van (1905-1956) and Ernst RUSKA (1906-1988). "Vorläufige Mitteilung über Fortschritte im Bau und in der Leistung des Übermicroskopes", offprint from: <I>Wissenschaftliche Veröffentlichungen aus den Siemens-Werken</I>, volume XVII, no.1, pp.99-106. Berlin: J. Springer, 1939. 4° (259 x 194mm). With a SIGNED PHOTOGRAPH OF ERNST RUSKA. It was at Siemens and Halske's Laboratory for Electron Optics that Borries and Ruska developed the electron microscope, and around 35 different apparatuses were mass-produced for research purposes up until 1945. When Borries left the laboratory in 1949 Ruska succeeded him as director, and continued to contribute substantially to the improvement of the microscope in subsequent years. Gedeon pp.428-33. | Christie's